Manufacturing method of the piston ring operative on every part of the cylinder with balanced compression



Sept. 5, 1939. T. HIRO 2,171,831

MANUFACTURING METHOD OF TH 15 N RING OPERATIVE ON EVERY PART OF THE CYLINDER H BALANCED COMPRESSION Filed Nov. 1, 1937 FIE.Z.

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Patented Sept. 5, 1939 PATENT OFFICE MANUFACTURING METHOD OF THE PISTON RING OPERATIVE N EVERY PART OF THE CYLINDER SION WITH BALANCED COMPRES- Tetsutaro Hiromi, Tokyo. Japan Application November-'1, 1937, Serial No. 172,250

1 Claim. (01. 29-15653) be expected and consequently the circle on the This invention relates to the method of manufacturing piston rings operative on every part of the inner surface of the cylinder with all pervading similarly balanced pressure and thus intends to accomplish the manufacture, easily and on a grand scale, of an ideal piston ring by operating balanced compression on the finished outer radius surface of the ring tube, utilizing the natural elastic nature of the ring body, and simply giving it strong well balanced center support without any other elaborate arrangements.

To attain the above stated purport in this invention, a ring body tube of bigger diameter than the inner surface of the cylinder with proper thickness and open ends, is to be prepared and these open ends of the ring should be so designed as to be brought in close contact with each other forming a perfect ring body tube.

Between the space of the inner surface of the cylinder or the shaft and the ring tube, selected material with comparatively low easy melting point, is to be filled to make the cylinder and the ring tube as a combined body. After the completion of the finishing operation on the ring body, the material filled up between the ring tube and the cylinder is to be removed by heating.

Fig. 1 in the attached drawing shows the vertical sectional view of the ring body tube when it is put in the condition of a combined body filled up with material of comparatively low melting point. Fig. 2 shows the plan of Fig. 1. Fig. 3 is an elevation after the completion of the finishing operation on the outer radius surface of the ring body. Fig. 4 is an elevation showing the cylinder and the ring body combined together as one complete body with melted material filled in between them.

The further specified explanation of the contents of these improvements To effect and complete the air compression operation of the piston ring in varioussorts of heat engines or compression engines in general, it is essential to put their piston rings in close touch with every part of their operative surfaces by giving the balanced compression. The method hitherto adopted in the manufacture of this sort of articles the finishing operation of the outer radius surface has been carried out only by keeping the body, which had gone through the proper preliminary working process, firm and immovable by strong resistance to it from the direction of radius.

By this method, the well balanced distribution of compression on the operative surface can not outer surface of radius can not be obtained. It should be rightly inferred that the elastic body such as this piston ring can maintain its shape of the free elastic nature keeping the operative nature of the balanced compression while the ends of the ring are closed by the necessary limit of the balanced compression on every part of the body or by means of the force given from the direction of the tangent, but once a stronger force than necessary, is put to the ring or it is inserted into the cylinder to shape it into a uniform type, the free elastic nature of the shape of the ring is at once broken in spite of the force so given.

In the method of manufacturing adapted to this invention, the outer surface of the ring body is properly finished by a simple strongly balanced center support without operating any such power as injurious or unnecessary to the natural elastic nature of the ring body, and consequently. the manufactured articles are not only perfectly well balanced in compression and accurately circular but the manufacturing process is quite simple.

Further detailed explanation of the attached drawing with examples In this invention, the ring body tube or the body ring I with open ends and with proper thickness and with bigger diameter than the inner diameter of the cylinder is first made and by proper method, for instance, the open ends of the tube are tightly bound with wire or belt or the open ends of the ring are soldered in contact by the power obtained from the tangent direction and then the shaft 2 with proper shape is arranged in the tube. and between the shaft and the body I and I, easily melting material of sticky nature, for instance, such material as the third class melted solder, is to be filled in and make the shaft and the body to be combined together as a whole body.

The general methods hitherto adapted to the manufacture of this sort of article, the finishing operation of the outer radius surface should only be effected by making the ring body firm and immovable by giving strong force to the body from the direction of radius, etc., but from this old method, the distribution of the well balanced compression can neither be expected from the manufactured articles nor can be obtained the accurate circle on the outer radius surface.

From the standpoint of the present invention, the shaft 2 is necessarily to be placed accurately in the center of the body I and I and the shape of the material used for this purpose should be circular or should have polygonal section.

It is suggested that the proper carved lines or projections 2' should be made to prevent the independent turning of the cylinder or the shaft. By fixing the shaft 2 on the lathe, the outer surface of the ring body is to be finished accurately circular and'thenthe cutting] shouldbe made at any proper-length. On the completion of above process the whole body ring is put into the furnace or the heat generator or should be heated after making the side oftheshaft 2 hollow, and the filled materialiin the'tube istobe melted thus the filled matter being separated.

Same effect should also be obtained by putting the filled materials with a low meltingpoint, in

the hot water or in a heated oil. The' material generally used for the filling purpose'areg.

Solder, lead, tin, zinc, aluminium, brass, antimony, bismuth, cadmium, alloys of abovestated materials, vWood's alloy (witha melting point 69 degrees), pitch, sealing. wax,.or any other materials which will be" easily melted at a low melting point and also avoid any ill :effect on the ring body. In case. when theffilled materials do not perfectly adher'to or when two or more scrap ings are necessary thej soldering of the body should bem ade zinc which possesses much with the axis of the'b'ody, compressing the body to bring thegdivided faces into contact to create tension on the body, fixing the body in its final form to the shaft through the use of a low melting solder filling the space between the shaft and the interior wall of the body to maintain the parts in rigid connection for working, and working the exterior of the body into piston ring formation, he. lo 'mel ines lcie when me ted freeing the b i ts c e es WO Q co dition rom the. shaft andpermitting the body to spread through ts nheren sil e cy t ermit compressive re, sistance of the piston rings formed from the body when in applied position.

TETLSUTAIRYO HIROMI. 

